SLIMS NEW WORLD - Why is Latin America's richest man betting big on computer retailing in the U.S.? After all, Mexican mogul Carlos Slim Helu is clueless when it comes to PCs, barely even able to boot up his own laptop. His bid for CompUSA took many by surprise. But his USD16 billion empire was built on buying up just such companies-hurting but undervalued. He hasn't missed yet